A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Improvements to mortise locks
A mortise lock with a deadbolt (27) and a gate 50 and pawl 42 arrangement operated by a cam lever (47) of a cylinder lock (48), the pawl movable from a disengaged position to an engaged position preventing movement of the deadbolt. The pawl is a sliding member engaged by cam lever and is selectively engaged by the gate via intermeshing teeth. The gate has an orthogonal tooth, e.g. square tooth 61, and a triangular tooth 52; the pawl having a rack with an orthogonal groove 62, rectangular tooth 65 and triangular tooth 58; the orthogonal surfaces of the teeth preventing the pawl from being jimmied/forced into the retracted/disengaged position. The pawl may include tapered surfaces (65, 66, fig.7) to hinder manipulation by a tool. The pawl may be guided by protrusion (45, fig.7) in a guide slot formed by half-shearing and partially punching side wall of the casing.
Improvements to mortise locks
A mortise lock with a deadbolt (27) and a gate 50 and pawl 42 arrangement operated by a cam lever (47) of a cylinder lock (48), the pawl movable from a disengaged position to an engaged position preventing movement of the deadbolt. The pawl is a sliding member engaged by cam lever and is selectively engaged by the gate via intermeshing teeth. The gate has an orthogonal tooth, e.g. square tooth 61, and a triangular tooth 52; the pawl having a rack with an orthogonal groove 62, rectangular tooth 65 and triangular tooth 58; the orthogonal surfaces of the teeth preventing the pawl from being jimmied/forced into the retracted/disengaged position. The pawl may include tapered surfaces (65, 66, fig.7) to hinder manipulation by a tool. The pawl may be guided by protrusion (45, fig.7) in a guide slot formed by half-shearing and partially punching side wall of the casing.
Improvements to mortise locks
ROGER CHANTLER (author) / IAN SOUTHALL (author)
2022-10-12
Patent
Electronic Resource
English